Nozzle for elastic-fluid turbines.



No. 814,425l PATENTE Mm" P, R. C. BOYD.

NGZZLE. FOR BLASTIG FLUID TURBINBS.

APPLGATION FILED 0GT.14. 1904.

2 SHEETS-SHEET 1.

GGG'GGCI gummill lllllllllllllmm f Inventor;

Freder F?. C-Boyd, @Y MM PATBNTED MAR.. e, 1906. F. R. C. BOYD. NozzLB FOR ELASTIC FLUID TURBINES.

APPLIG ATION FILED OGT.14.1904.

2 SHEETS-SHEET 2.

NIMH r d o y.. to t. n W6. nR I .n

Witnesses:

' sive parts to construct, owingr to the amount trate an embodiment of 3o of Fig. l.

partition.

ted lines; and

5o as many pairs as there Unirse smiles rarest? ernten.,

FREDERIC lt. C. BOYD, OF LYNN, MASSACHUSE'TS, ASSIGNOR T() HEN- ERAL ELECTRLU COll/PNY, A- UORPOltATlON UF NEW YORK.

patented nieren e, ieee.

Application filed October lll, i994. Serial No 228,377.

o Il whom, it muy concern:

Be it known that l, FREDERIC R. C. Born, a. citizen of the United States, residing et Lynn, county of Essex, State ot" lviasssclni-L setts, have invented certein new and useful Improvements in Nozzles for ElasticFluid Turbines, of which the following?r is s. specification.

At the present time the nozzles of .a jet-turbine are the most, or one of the most, expenof work required to form them accurately.

The present invention has for its object to ninprove the construction of nozzles for eles 15 tic-lluid-'-turb ines, first, by decreasing the cost of manufacture; second, by using interchangeable parts, which permit oi renewal when necessery, and, third, by confining all of the expansion to one plane, which reduces 2o the tendency of the jet to spread rapidlysfter leaving the nozzle and also reduces the tendency to the creation of eddies in the nozzlepassage. f

ln t ie accompenyingdrawings, which illusmy invention, Figure 1 is s view in elevation looking into the receiving ends of the nozzle. Fig. 2 is a. sectional view taken at right angles to that of Fig. l. Fig. 3 is a section taken on line 3 3 Fig. 4 is a side View of a nozzle Fig. 5 is an end View of the seme. Fig. 6 is an elevation of one of the partitions on an enlarged scale and assembled in the nozzle-plete, the latter being shown in dot- Fig. 7 is a detail view showing a more complete structure with controllingvalves.

1 represents the casing of the turbine, having en opening to receive the nozzle-plate 2.

4o The plate is provided with a curved slot 3,

conforming to the curvature of the buckets wheel 4. The slet should be accurately made, as its side Walls form the sides of the nozzleesections. it can with advantage be formed by a radial milling-cutter properly set to give 'the desired angles. The walls are preferably parallel, but inay diverge or converge, ss desired.. Formed in the side wells of the slot are pairs of grooves 5, there beiner are partitions The grooves ol" each pair are directly opposite and receive the projections or feathers 7 on the partitions.

The grooves 5 resemble to e, cerL tain extent a screW-thread of coarse pitch.

They may extend from one side ol' the nozzle plete. to the other, or they may extend only part wa in the latter case the surface ci the bow. unbroken, which is zulvantagcous in that it reducesA` eddies. The parti-tions control the expansion ol thc. motive fluid; hence they must be accurately formed. As shown, they taper from one end to the other nud conform to the shape of the slot. ln manufacturing the partitions -in large quantities special niscl'iinery is preferably employed; but where they are made in small quantities a milling-machine lwill be found to be satisfactory to produce the l'orm shown in Fig'. 4. The. curvature illustrated in Fig. 5 een best be formed on a face-plate, as el' a lathe or-boring-inill. lt is preferable to mount a number of partitions on the machine and form them in a single operution. The large ends ofthe partitions are curved seinewhat, as shov 'n in Fig. 2, to form bowls 8, and the formation of these bowls has an impor tent beztring on the flow of fluid through the nozzle-passages. The partitions in a given nozzle ere alike, and beingt interchangmible new ones een be substituted whenv the old ones ere worn. Further, the expansion ratio between the throat or narrowest part of each nozzlefpnssage and the discharge end can be changed by substituting,r partitions havinpr different shapes. For example, the portitions may be oi uniform thickness, in which ease the nozzle-seetionswould have no expansion, or the expansion may be greater or less than that shown. lt is to be noted that the throat and discharge end of each sectioniare rectangular in forni, and the stream of motive fluid is thus eflectively delivered to the bucle ets. ln all oi the ceses specified the projections on the edges of the partitions remain the same. -j L As has been stated, the walls of the slot in the nozzle-plete are parallel, and the expension is provided for by the shape ofthe partitions. This means that the expansion will take lace in e cireunli'ercntial und not in a radiftlldirecton, which reduces the tendency of the jet issuingr from the several sections to spread radially and also reduces th(l tendency ol! the fluid to create eddies.

The partitions instead of being' provided with projections which lit into grooves in the nozzle-pate rnsy be held in place by screws, pins, or the like. The usent projections is IOC) - in groups. Surrounding the valves and the admission ends of' the nozzles is the valvechest 13.

in the construction shown in Fig. 2 the end portions ot the .slot in the nozzle-plato forni parts ol: the end nozzle-sections. This means that they will have to he specially lforrned and W 5 this is not diilicnlt, owing to the length ol the slot, it takes considerable time. Fig. 7 is shown an arrangement of parts where the abovo-mentioned operation is unnecessary. The slot in the nozzle-plate 2 is n'iadeslightly longer than before and is pro vided with extra grooves to receive the end partitionst1\e said partitions taking the place of the finished ends oi' the slot in Fig. 2. Between the ends ol the slot and the adjacent partitions are idling-blocks 1d. So longas they pre ent 'the escape ot iluid 4their construction is immaterial.

. in accordance with the provisions of the pa tent statutes l. have described the rinciple of operation of my invention, toget vier with the apparatus which l new consider to he the liest enilwdinient thereof; lout I desire to have it uinlerstood that the apparatus shown is onlyA i llustra tive and that the invention can be carried out by other means. What l claim as new, and desire to secure by Letters Patent of the United States, is`- 1 ln a nozzle, the combination of a nozzleplate containing a slot having concentric eis/tee walls, detachable `partitions lated inthe slot for dividing it into passages, and supplyports for the passages.

ln a nozzle, the comblnation of a'noz'zleplate containing a slot having concentric walls, detachable partitions located in the slot for dividing it into passages, a ported plate whose ports register withthe admission ends of the passages, and a chest whichv inclosesA the ported plate.

5. ln a nozzle, the combination of a slotted nozzle-plate, partitions located' in the slot for.`

dividingitinto passages,a ported plate whose ports register withl the admission ends of the passages, valves for controlling the passage of fluid to the nozzle-passages, and a chest which ineloses the plate and valves.

6. A turbine comprising: a bucket-wheel and casing, in combination with a nozzle attached to the casing and comprising a nozzlev plate, a detachab partition which -forms passages in the plate, and valves which cons'.

trol the admission of fluid to said passages. In Witness whereof I have hereunto set my hand this 12th day of October, 19.(24.

FREDERIC n, e Born.- Y yl/Vitnes-ses: l l

Jornv A. McMANUs, Jr., HENRY O. WESTENDARP. 

